When the time of preoxidation was same, the combining intensity of alloy-porcelain decreased with the time prolonging of degassing.
在相同的预氧化时间的条件下，金-瓷结合强度随除气时间延长也呈递减趋势。
The paper introduces the preoxidation two periods nitriding technology. The technology makes use of the catalysis of preoxidation enough to shorten nitriding technology time.
采用预氧化两段式气体渗氮工艺，充分利用预氧化的催渗作用，达到缩短渗氮工艺周期的目的。
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